Design and optimization of a three-row precision seed-metering device for Bok Choy
In order to improve the low sowing efficiency of the traditional single-row and double-row sowing patterns in China,this paper designed a novel three-row precision seed-metering device with the"Shanghai Aiji"Bok Choy seeds as the research object,and analyzed the working principle of the seed-metering device.The relevant parameters of the key components of the designed seed-metering device were calculated using relevant mathematical theory.The internal airflow field of the seed-metering device was analyzed using FLUENT software and the optimum number of suction holes was determined.The negative pressure,the angular speed of the seeding plate and the cone angle of the suction hole were used as experiment factors,and the performance indicators of the seed-metering device were the qualified rate and missed seeding rate when seeding.When the negative pressure was-2.16 kPa,the angular speed of the seeding plate was 29.43 r/min and the cone angle of the suction hole was 61.51°,the qualified rate of the inner ring was 95.12%and the missed seeding rate was 3.67%,the qualified rate of the middle ring was 94.68%and the missed seeding rate was 3.12%,and the qualified rate of the outer ring was 94.24%and the missed seeding rate was 2.58%.Finally,bench and field experiments were conducted to verify the reasonableness of the best combination of parameters obtained.
Bok Choythree-row precision seed-metering deviceairflow fieldbench experimentsfield experiments
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